Lucinda put $66 into a cd that pays 5.7% interest. according to the rule of 72, approximately how long will it take for her money to double?

13 years

Step-by-step explanation:

It is given that,

Lucinda put $66 into a CD that pays 5.7% interest. According to the rule of 72,  

The rule of 72  

It is a simplified way to determine, If we invest some amount, how long that investment will take to double,

Formula

Let R be the rate of interest,

The time required to take double the amount = 72/R

Calculate the approximate years

According to the rule of 72, approximately 12.63 ≈ 13 years will it take for her money to double

Since we are told that the tank holds 1,000 cubic meters of oil, we know that we are dealing with volume (cuz volume is measured in cubic units, right?). So the formula for the volume for a cylinder is
 Our given bits of information are the radius and the volume itself, and we are solving for h, the height of the tank.  Fill in like this:

Doing all that math on the right gives you this: 1,000=9.42h and dividing both sides by 9.42 gives you that the height is 106.2 or, to the nearest meter, 106 meters.